# Basics {% embed url="" %} To change the size of your brush, slide your finger left and right on your hand UI. In the menu, you can find various brushes and special effects, fire for example. At the top of the menu, you can switch to the color wheel tab and on the sides, you can find a palette with your favorite colors. At the bottom you can find your operations: you can draw freehand, with shapes such as lines, circles, and spheres. You can also erase any of your brush strokes. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://learn.overlaymr.com/sketch-editor/basics.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.